/**
 * Copyright 2011 Honeywell Federal Manufacturing & Technologies, LLC. This material was produced under U.S. Government
 * contract DE-ACO4-01AL66850, Honeywell Federal Manufacturing & Technologies, LLC, (FM&T) with the U. S. Department of
 * Energy for the operation of the Kansas City Plant . The U.S. Government has rights to use, reproduce, and distribute
 * this software.  NEITHER THE GOVERNMENT NOR Honeywell Federal Manufacturing & Technologies, LLC, MAKES ANY WARRANTY,
 * EXPRESS OR IMPLIED, OR ASSUMES ANY LIABILITY FOR THE USE OF THIS SOFTWARE.  If software is modified to produce
 * derivative works, such modified software should be clearly marked, so as not to confuse it with the version available
 * from FM&T.
 *
 * Additionally, this program is free software; you can redistribute it and/or modify it under the terms of the GNU
 * General Public License Version 3 published by the Free Software Foundation. Accordingly, this program is distributed in
 * the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this library.
 * If not, see http://www.gnu.org/licenses/.
 */
package org.braintrain.domain;

import javax.persistence.*;
import java.io.Serializable;
import java.util.Set;

@Embeddable
public class NavigationBundle implements Serializable {
    private Navigation next;
    private Set<Navigation> prevSet;
    
    @ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.LAZY)
    @JoinColumn(name="next")
    public Navigation getNext() {
        return next;
    }
    public void setNext(Navigation next) {
        this.next = next;
    }
    
    @OneToMany(fetch=FetchType.LAZY)
    @JoinColumn(name="next", insertable=false, updatable=false)
    public Set<Navigation> getPrevSet() {
        return prevSet;
    }
    public void setPrevSet(Set<Navigation> prevSet) {
        this.prevSet = prevSet;
    }
    
    @Transient
    public Navigation getPrev()
    {
        Set<Navigation> prev = getPrevSet();
        
        if(prev != null && prev.size() > 0)
        {
            return prev.iterator().next();
        }
        return null;
    }
}
